This kit doesn't require any additional pump supplies ... water is draw and exits the reactor through the use of the pump supplied.

The alcohol can either be syringed or a constant drip rate (using pump supplied) can be achieved for constant feeding .. increasing or decreasing to match the nitrates within your system.

Also due to its pressurised design allows you to sit the reactor below the water level ... allowing the nitrate reactor to sit in the cabinet while pushing the effluent back to the raised aquarium above.